Springer's Damsel (Chrysiptera springeri) is a damsel that many regard as the "Flatworm eating" damsel. A lot of damsels eat flatworms but this one in particular stays smaller with a max size of about 2 inches. It also lacks the aggressiveness that many damsels display.
They will eat prepared foods rather easily and have been known to breed in aquariums. This fish is not commonly available like many other damsels.